Fulle, Marco; Bertini, I; Della Corte, V; Güttler, C; Ivanovski, S; La Forgia, F; Lasue, J; Levasseur-Regourd, A C; Marzari, F; Moreno, F; Mottola, S; Naletto, G; Palumbo, P; Rinaldi, G; Rotundi, A; Sierks, H; Barbieri, C; Lamy, P L; Rodrigo, R; Koschny, D; ... (2018). The phase function and density of the dust observed at comet 67P/Churyumov–Gerasimenko. Monthly notices of the Royal Astronomical Society, 476(2), pp. 2835-2839. Oxford Academic 10.1093/mnras/sty464
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sty464.pdf - Published Version Available under License Publisher holds Copyright. This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 the Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Download (204kB) | Preview |
The OSIRIS camera onboard Rosetta measured the phase function of both the coma dust and
the nucleus. The two functions have a very different slope versus the phase angle. Here, we
show that the nucleus phase function should be adopted to convert the brightness to the size of
dust particles larger than 2.5 mm only. This makes the dust bursts observed close to Rosetta
by OSIRIS, occurring about every hour, consistent with the fragmentation on impact with
Rosetta of parent particles, whose flux agrees with the dust flux observed by GIADA. OSIRIS
also measured the antisunward acceleration of the fragments, thus providing the first direct
measurement of the solar radiation force acting on the dust fragments and thus of their bulk
density, excluding any measurable rocket effect by the ice sublimation from the dust. The
obtained particle density distribution has a peak matching the bulk density of most COSIMA
particles, and represents a subset of the density distribution measured by GIADA. This implies
a bias in the elemental abundances measured by COSIMA, which thus are consistent with the
67P dust mass fractions inferred by GIADA, i.e. (38 ± 8) per cent of hydrocarbons versus the
(62 ± 8) per cent of sulphides and silicates.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences 08 Faculty of Science > Physics Institute 08 Faculty of Science > Physics Institute > NCCR PlanetS |
UniBE Contributor: |
Thomas, Nicolas |
Subjects: |
500 Science > 520 Astronomy 600 Technology > 620 Engineering |
ISSN: |
0035-8711 |
Publisher: |
Oxford Academic |
Language: |
English |
Submitter: |
Dora Ursula Zimmerer |
Date Deposited: |
15 May 2018 09:55 |
Last Modified: |
05 Dec 2022 15:14 |
Publisher DOI: |
10.1093/mnras/sty464 |
BORIS DOI: |
10.7892/boris.116507 |
URI: |
https://boris.unibe.ch/id/eprint/116507 |
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